Firearm rear sight



FIG. 1 is a front perspective view of the firearm rear sight embodying the new design;

FIG. 2 is a top left side view thereof;

FIG. 3 is a top right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a rear perspective view thereof.

The broken lines depict portions of the firearm rear sight that form no part of the claimed design. The broken lines immediately adjacent to the shaded portions depict the boundaries of the claim and form no part thereof. 

CLAIM The ornamental design for a firearm rear sight, as shown and described. 